Section 2: Other Relevant Information
National Bridge Inventory (NBI) Number
The NBI number is a 15-digit number or alpha-numeric string that uniquely identifies each bridge and typically contains information about the location of the bridge. This may also be referred to as a bridge’s structure ID or permanent structure number (PSN). NBI numbers must be unique to each structure; they cannot be changed after a bridge is added to the inventory, nor can they be reused when a bride is replaced. Bridges that are being widened or rehabilitated retain their PSNs.
The assignment of NBI numbers for new and replacement structures depends on whether the bridge is on-system or off-system.
On-system numbers
NBI numbers for on-system bridges are managed centrally by the Bridge Division. To obtain an NBI number for a new or replacement structure, District personnel submit a request through TxDOT’s Permanent Structure Number (PSN) web application. For additional information on this system and how to submit a request, refer to the PSN User Guide (available on the Bridge Division’s intranet site).
Off-system numbers
NBI numbers for off-system bridges are managed by each individual District. To obtain an NBI number for a new or replacement structure, work with the District bridge office. For additional guidance on the assignment of off-system NBI numbers, refer to the Bridge Division’s Guide for Assigning Off-System Bridge IDs (available on the Bridge Division’s intranet site).